1. A zero discharge wastewater system, comprising:

a water inlet pipeline for conveying wastewater;

the inlet of the atomization mechanism is connected with the outlet of the water inlet pipeline, and the atomization mechanism can atomize the wastewater;

the evaporator comprises an evaporation cavity; the outlet of the atomization mechanism is arranged in the evaporation cavity and can convey atomized wastewater into the evaporation cavity; the evaporator is provided with a high-temperature gas inlet and can receive high-temperature gas; the evaporator is provided with a gas outlet, and the gas outlet is arranged in the evaporation cavity;

the gas disperser is arranged in the evaporation cavity; the gas disperser is connected with the high-temperature gas inlet and can disperse the high-temperature gas entering from the high-temperature gas inlet to the evaporation cavity, so that the high-temperature gas can exchange heat with the atomized wastewater entering the evaporation cavity, the atomized wastewater absorbs heat and is evaporated into steam, and the steam can be discharged from the gas outlet;

and the inlet of the dust remover is connected with the gas outlet and can absorb impurities in the gas discharged from the gas outlet, and the outlet of the dust remover discharges the gas subjected to dust removal.

2. The wastewater zero discharge system of claim 1, characterized in that:

the gas disperser comprises a grid mechanism, and the grid mechanism comprises a plurality of grids which respectively form a plurality of atomized wastewater channels, a plurality of high-temperature gas channels and a plurality of evaporation channels;

an atomized wastewater channel is matched with a high-temperature gas channel, and the outlet of the atomized wastewater channel and the outlet of the high-temperature gas channel are connected to the corresponding evaporation channels.

3. The wastewater zero discharge system of claim 1, characterized in that:

the wastewater zero-discharge system comprises a main control circuit; a sensor group is arranged in the evaporation cavity and comprises at least one of a temperature sensor, a humidity sensor and an air pressure sensor; and the output end of the sensor group is connected with the input end of the main control circuit.

4. The wastewater zero discharge system of claim 3, characterized in that:

the waste water zero discharge system also comprises valves respectively arranged on the water inlet pipeline, the high-temperature gas inlet and the gas outlet, wherein the output end of the main control circuit is connected with the input end of each valve and can send a control signal for controlling the operation of the valves.

5. The wastewater zero discharge system of claim 2, characterized in that:

the waste water zero discharge system also comprises a grid adjusting mechanism, wherein the grid adjusting mechanism is connected with the grid mechanism and can adjust the distance between grids in the grid mechanism, so that the waste water zero discharge system can adapt to different high-temperature gases or/and waste water.

6. The wastewater zero discharge system of claim 1, characterized in that:

the high-temperature gas comprises high-temperature flue gas.

7. The wastewater zero discharge system of claim 1, characterized in that:

the dust remover comprises a bag-type dust remover.

8. A control method of a zero discharge wastewater system, characterized in that the control method comprises:

controlling the wastewater to enter an atomization mechanism through a water inlet pipeline for atomization; the atomized wastewater enters an evaporation cavity in the evaporator;

controlling high-temperature gas to enter an evaporator, dispersing the high-temperature gas by a gas disperser, and then entering an evaporation cavity;

in the evaporation cavity, the atomized wastewater and the high-temperature gas exchange heat, so that the atomized wastewater absorbs heat and is evaporated into steam, and the steam can be discharged from the gas outlet.

9. The control method according to claim 8, characterized in that:

the control method further includes:

and acquiring the information of temperature, humidity and air pressure in the evaporation cavity, and controlling a waste water discharge valve, a high-temperature gas inlet valve and a gas outlet valve of the evaporator according to the information.

10. The control method according to claim 8, characterized in that:

the control method further includes:

and acquiring the information of temperature, humidity and air pressure in the evaporation cavity, and controlling the distance between the grids in the evaporation cavity according to the information.

Background

With the release of the national water pollution prevention and control plan, higher requirements are put forward on water use and drainage of the thermal power plant, and the construction of a thermal power plant wastewater zero-discharge system gradually becomes a development trend of thermal power plant wastewater treatment. The strict zero discharge of waste water is mainly to take measures to prevent water which has any adverse effect on the environment from being discharged to the outside, and the water entering a power plant finally enters the atmosphere in the form of steam or is sealed and buried in a proper form such as sludge and the like. This means that a true zero discharge of waste water should be achieved in that all the liquid to be discharged is discharged in the form of water vapor or solids, without any discharge in liquid form.

After deep water saving is realized through water and drainage planning and gradient recycling, the final end waste water which is produced by the thermal power plant and cannot be consumed mainly comprises high-salt waste water discharged by an ion exchange regeneration system and desulfurization waste water which meets the discharge standard after treatment. As salt in all water used in the whole plant enters the part of wastewater in various forms, the main water quality is characterized by high salt content, belonging to saturated solution of calcium sulfate, large scaling tendency and strong corrosivity.

With the increase of the national requirements on wastewater discharge, the existing wastewater treatment mode can not meet the national requirements.

In view of the above, there is an urgent need to design a new wastewater discharge system to overcome at least some of the above-mentioned disadvantages of the existing wastewater discharge systems.

Disclosure of Invention

The invention provides a wastewater zero discharge system and a control method thereof, which can quickly and effectively atomize and evaporate wastewater and meet the requirement on wastewater treatment.

In order to solve the technical problem, according to one aspect of the present invention, the following technical solutions are adopted:

a zero-discharge wastewater system, comprising:

a water inlet pipeline for conveying wastewater;

the inlet of the atomization mechanism is connected with the outlet of the water inlet pipeline, and the atomization mechanism can atomize the wastewater;

the evaporator comprises an evaporation cavity; the outlet of the atomization mechanism is arranged in the evaporation cavity and can convey atomized wastewater into the evaporation cavity; the evaporator is provided with a high-temperature gas inlet and can receive high-temperature gas; the evaporator is provided with a gas outlet, and the gas outlet is arranged in the evaporation cavity;

the gas disperser is arranged in the evaporation cavity; the gas disperser is connected with the high-temperature gas inlet and can disperse the high-temperature gas entering from the high-temperature gas inlet to the evaporation cavity, so that the high-temperature gas can exchange heat with the atomized wastewater entering the evaporation cavity, the atomized wastewater absorbs heat and is evaporated into steam, and the steam can be discharged from the gas outlet;

and the inlet of the dust remover is connected with the gas outlet and can absorb impurities in the gas discharged from the gas outlet, and the outlet of the dust remover discharges the gas subjected to dust removal.

As an embodiment of the present invention, the gas disperser includes a grid mechanism, and the grid mechanism includes a plurality of grids, which respectively form a plurality of atomized wastewater channels, a plurality of high-temperature gas channels, and a plurality of evaporation channels;

an atomized wastewater channel is matched with a high-temperature gas channel, and the outlet of the atomized wastewater channel and the outlet of the high-temperature gas channel are connected to the corresponding evaporation channels.

As an embodiment of the invention, the wastewater zero discharge system comprises a main control circuit; a sensor group is arranged in the evaporation cavity and comprises at least one of a temperature sensor, a humidity sensor and an air pressure sensor; and the output end of the sensor group is connected with the input end of the main control circuit.

As an embodiment of the present invention, the wastewater zero discharge system further includes valves respectively disposed on the water inlet pipeline, the high temperature gas inlet, and the gas outlet, and the output end of the main control circuit is connected to the input ends of the valves, and can send control signals for controlling the valves to operate.

According to one embodiment of the invention, the zero discharge system of wastewater further comprises a grid adjusting mechanism, wherein the grid adjusting mechanism is connected with the grid mechanism and can adjust the distance between grids in the grid mechanism so as to adapt to different high-temperature gases or/and wastewater.

As an embodiment of the present invention, the high temperature gas includes high temperature flue gas.

As an embodiment of the present invention, the dust collector includes a bag-type dust collector.

According to another aspect of the invention, the following technical scheme is adopted: a control method of a zero-discharge wastewater system, the control method comprising:

controlling the wastewater to enter an atomization mechanism through a water inlet pipeline for atomization; the atomized wastewater enters an evaporation cavity in the evaporator;

controlling high-temperature gas to enter an evaporator, dispersing the high-temperature gas by a gas disperser, and then entering an evaporation cavity;

in the evaporation cavity, the atomized wastewater and the high-temperature gas exchange heat, so that the atomized wastewater absorbs heat and is evaporated into steam, and the steam can be discharged from the gas outlet.

As an embodiment of the present invention, the control method further includes: and acquiring the information of temperature, humidity and air pressure in the evaporation cavity, and controlling a waste water discharge valve, a high-temperature gas inlet valve and a gas outlet valve of the evaporator according to the information.

As an embodiment of the present invention, the control method further includes: and acquiring the information of temperature, humidity and air pressure in the evaporation cavity, and controlling the distance between the grids in the evaporation cavity according to the information.

The invention has the beneficial effects that: the wastewater zero discharge system and the control method thereof can quickly and effectively atomize and evaporate the wastewater and meet the requirement on wastewater treatment.

In a use scene of the invention, the system of the invention adopts a high-temperature flue gas bypass evaporation technology, and has the advantages that:

(1) realizing zero emission

The real zero discharge of no waste water, no waste gas and no waste solid after the waste water treatment is realized.

(2) High evaporation efficiency and avoiding scaling

The slurry has fine fog drops (average about 50 mu m), the contact specific surface area is increased, the thick liquid is dried at a drying speed, the whole process from wet materials to dry powder products is quickly finished, and the phenomenon that the materials are stuck on the wall is avoided.

(3) Flexible adjustment of sprayer

The atomizer realizes the frequency conversion design, also can realize good evaporation effect when the boiler load changes, adjusts in a flexible way.

(4) The system is stable and reliable

The rotary spraying system is a reliable liquid drying technology, has strong abrasion resistance and blockage resistance, does not need pretreatment on raw wastewater, and has good adjustability and adaptability to wastewater.

(5) By-pass evaporation without influence on original system

The problems of blockage, scaling and the like possibly existing in a flue direct injection scheme, and once the problems are serious, the normal operation of a boiler system can be influenced by the need of maintenance; the bypass evaporation can not cause adverse effect to the original system, and can be carried out in an isolated way even if the maintenance is carried out.

Drawings

Fig. 1 is a schematic diagram of the composition of a wastewater zero discharge system according to an embodiment of the present invention.

Fig. 2 is a schematic connection diagram of a wastewater zero discharge system according to an embodiment of the present invention.

Fig. 3 is a schematic connection diagram of a wastewater zero discharge system according to an embodiment of the invention.

Detailed Description

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.

The description in this section is for several exemplary embodiments only, and the present invention is not limited only to the scope of the embodiments described. It is within the scope of the present disclosure and protection that the same or similar prior art means and some features of the embodiments may be interchanged.

The steps in the embodiments in the specification are only expressed for convenience of description, and the implementation manner of the present application is not limited by the order of implementation of the steps. The term "connected" in the specification includes both direct connection and indirect connection.

Fig. 1 is a schematic diagram illustrating a composition of a zero-discharge wastewater system according to an embodiment of the present invention, and fig. 2 and 3 are schematic diagrams illustrating a connection of the zero-discharge wastewater system according to an embodiment of the present invention; referring to fig. 1 to 3, the system for zero discharge of wastewater includes: water inlet pipe 5, atomizing mechanism 2, evaporimeter 1, gas disperser 3 and dust remover 4.

The water inlet pipeline 5 is used for conveying wastewater; the inlet of the atomization mechanism 2 is connected with the outlet of the water inlet pipeline 5, and wastewater can be atomized. The atomizing mechanism 2 may be disposed within the evaporator 1.

The evaporator 1 comprises an evaporation cavity 10; the outlet of the atomization mechanism 2 is arranged in the evaporation cavity 10, and atomized wastewater can be conveyed into the evaporation cavity 10; the evaporator 1 is provided with a high-temperature gas inlet 101 which can receive high-temperature gas; the evaporator 1 is provided with a gas outlet 102, and the gas outlet 102 is arranged in the evaporation cavity 10. In one embodiment, the high temperature gas may include high temperature flue gas and high temperature tail gas.

The gas disperser 3 is arranged in the evaporation cavity 10; gas disperser 3 connects high-temperature gas entry 101 (high-temperature gas entry 101 joinable high-temperature gas delivery pipeline 6), can with follow the high-temperature gas that high-temperature gas entry 101 got into disperses to evaporation cavity 10 to can carry out the heat exchange with the atomizing waste water that gets into evaporation cavity 10, make the heat absorption of atomizing waste water evaporate into vapor, can follow gas outlet 102 discharges.

The inlet of the dust remover 4 is connected with the gas outlet 102 and can absorb impurities in the gas discharged from the gas outlet 102, and the outlet of the dust remover 4 discharges the dust-removed gas. In an embodiment, the dust collector 4 may be a bag-type dust collector, but other dust collectors may also be used.

As shown in fig. 2 and 3, the system for zero discharge of wastewater may further include a fan 11 and a chimney 12, wherein the output of the dust remover 4 is connected to the fan 11 through a pipeline, and the fan 11 is connected to the chimney 12 through a pipeline.

In an embodiment of the present invention, the gas disperser 3 includes a grid mechanism, and the grid mechanism includes a plurality of grids, which respectively form a plurality of atomized wastewater channels, a plurality of high temperature gas channels, and a plurality of evaporation channels. An atomized wastewater channel is matched with a high-temperature gas channel, and the outlet of the atomized wastewater channel and the outlet of the high-temperature gas channel are connected to the corresponding evaporation channels.

In an embodiment of the present invention, the wastewater zero discharge system includes a main control circuit 7; a sensor group 8 is arranged in the evaporation cavity 10 (or/and in the high-temperature gas conveying pipeline 6 and at the output port of the dust remover 4), and the sensor group 8 comprises at least one of a temperature sensor 801, a humidity sensor 802 and an air pressure sensor 803; the output end of the sensor group 8 is connected with the input end of the main control circuit 7. A plurality of temperature sensors 801, humidity sensors 802 and air pressure sensors 803 can be arranged in the evaporation cavity 10 (or/and the high-temperature gas conveying pipeline 6 and the output port of the dust remover 4).

In an embodiment of the present invention, the wastewater zero discharge system further includes valves 9 respectively disposed on the water inlet pipeline, the high temperature gas inlet, and the gas outlet (of course, the valves 9 may be disposed only at the high temperature gas delivery pipeline 6), and the output end of the main control circuit 7 is connected to the input end of each valve 9, and can send a control signal for controlling the operation of the valve 9.

In an embodiment of the invention, the zero discharge system of wastewater further comprises a grid adjusting mechanism, wherein the grid adjusting mechanism is connected with the grid mechanism and can adjust the distance between grids in the grid mechanism so as to adapt to different high-temperature gases or/and wastewater.

In addition, the zero discharge system of waste water can also include atomizing speed regulator 14, and atomizing speed regulator 14 is connected atomizing mechanism 2, can adjust the atomizing speed of atomizing mechanism 2.

The application process of the wastewater zero discharge system comprises the following steps:

after the high-temperature hot gas enters the evaporator through the gas disperser and contacts with liquid drops (the average diameter of the liquid drops is about 50 microns) sprayed from the rotary sprayer, fine liquid drops in the smoke are quickly evaporated. By controlling the gas distribution, the slurry flow rate and the droplet size, it is ensured that the droplets are dry before contacting the walls of the evaporator. Part of the dry product, including fly ash, falls to the bottom of the evaporator and is sent to the transport system. The treated flue gas flows to a dust separator where the remaining suspended solids are removed. And the flue gas which is discharged from the dust remover and meets the emission standard is conveyed to a chimney through a draught fan and then is discharged.

The invention further discloses a control method of the wastewater zero-discharge system, which comprises the following steps:

step S1, controlling the wastewater to enter an atomization mechanism through a water inlet pipeline for atomization; the atomized wastewater enters an evaporation cavity in the evaporator;

(S2) controlling the high-temperature gas to enter an evaporator, dispersing the high-temperature gas by a gas disperser, and then entering an evaporation cavity in the evaporator;

step S3, in the evaporation cavity, the atomized wastewater exchanges heat with the high-temperature gas, so that the atomized wastewater absorbs heat and evaporates into vapor, which can be discharged from the gas outlet.

In an embodiment of the present invention, the control method further includes: and acquiring the information of temperature, humidity and air pressure in the evaporation cavity, and controlling a waste water discharge valve, a high-temperature gas inlet valve and a gas outlet valve of the evaporator according to the information.

In an embodiment of the present invention, the control method further includes: and acquiring the information of temperature, humidity and air pressure in the evaporation cavity, and controlling the distance between the grids in the evaporation cavity according to the information.

In conclusion, the wastewater zero discharge system and the control method thereof provided by the invention can be used for rapidly and effectively atomizing and evaporating wastewater, and meet the requirement on wastewater treatment.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The description and applications of the invention herein are illustrative and are not intended to limit the scope of the invention to the embodiments described above. Effects or advantages referred to in the embodiments may not be reflected in the embodiments due to interference of various factors, and the description of the effects or advantages is not intended to limit the embodiments. Variations and modifications of the embodiments disclosed herein are possible, and alternative and equivalent various components of the embodiments will be apparent to those skilled in the art. It will be clear to those skilled in the art that the present invention may be embodied in other forms, structures, arrangements, proportions, and with other components, materials, and parts, without departing from the spirit or essential characteristics thereof. Other variations and modifications of the embodiments disclosed herein may be made without departing from the scope and spirit of the invention.